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• W1691655870 abstract "The geometry and constituent materials of metastructures can be used to engineer the thermal expansion coefficient. In this thesis, we design, fabricate, and test thin thermally stable metastructures consisting of bi-metallic unit cells and show how the coefficient of thermal expansion (CTE) of these metastructures can be finely and coarsely tuned by varying the CTE of the constituent materials and the unit cell geometry. Planar and three-dimensional finite element method modeling is used to drive the design and inform experiments, and predict the response of these metastructures. We demonstrate computationally the significance of out-of-plane effects in the metastructure response. We develop an experimental setup using digital image correlation and an infrared camera to experimentally measure full displacement and temperature fields during testing and accurately measure the metastructures’ CTE. We experimentally demonstrate high aspect ratio metastructures of Ti/Al and Kovar/Al which exhibit near-zero and negative CTE, respectively. We demonstrate robust fabrication procedures for thermally stable samples with high aspect ratios in thin foil and thin film scales. We investigate the lattice structure and mechanical properties of thin films comprising a near-zero CTE metastructure. The mechanics developed in this work can be used to engineer metastructures of arbitrary CTE and can be extended to three dimensions." @default.
• W1691655870 created "2016-06-24" @default.
• W1691655870 creator A5080033972 @default.
• W1691655870 date "2013-01-01" @default.
• W1691655870 modified "2023-09-27" @default.
• W1691655870 title "Thin Metastructures with Engineered Thermal Expansion" @default.
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• W1691655870 doi "https://doi.org/10.7907/m69r-3a76." @default.
• W1691655870 hasPublicationYear "2013" @default.
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